Tag someone you lava 🌋 Io, the third-largest moon of Jupiter, is the most volcanically active world in the solar system. Extreme tidal forces from the gas giant (and nearby moons Ganymede and Europa) generate tremendous heat within Io, triggering eruptions from the moon's subsurface crust. Though Io has hundreds of huge volcanoes, it was still an impressive sight for NASA's Galileo spacecraft to spot an eruption in action when it flew past the moon in 1997. Launched in 1989, Galileo was the first spacecraft to enter Jupiter's orbit, studying the planet and its moons for nearly 10 years. Image description: Half of Io, a shiny, chrome-colored world with a maze of rough patches, is seen from space at a close distance. Near the very top, a small blue burst indicates a volcanic eruption. Credit: NASA/JPL-Caltech, DLR #NASA #Space #Moon #Io #Jupiter #Volcano #Eruption